Introduction

Recent Progress in Flexible and Wearable All Organic Photoplethysmography Sensors for SpO2 Monitoring

“…[ 39,40 ] Moreover, using organic semiconductor components for LEDs and PDs in pulse oximetry are more promising for providing accurate measurements in body conformal electronics than using conventional inorganic material‐based components in area‐comparable pulse oximeters [ 41,42 ] Thus parallel efforts are been made by researchers to fabricate flexible and conformal biosensors with organic semiconductors as active elements that are intrinsically soft and flexible by nature. [ 43–45 ] Moreover, organic semiconductors with low‐cost solution processing abilities, [ 46,47 ] bio‐compatibility [ 48 ] and light weightiness [ 49 ] can be directly coated onto ultra‐thin, [ 50 ] flexible [ 51,52 ] and conformal polymeric substrates. [ 53 ] They are seamlessly integrated with large areas of curvy body surfaces and at the same time provide better local skin conformability, without having the constraint of miniaturization, unlike inorganic components.…”